Well, only one side of the curb should have grass/mud next to it… the other is bordered by the road. Sometimes when i am doing the top of the curb next to the grass side, i will stand on the grass and shoot towards the road for that section. Just have to keep a little control on the wand so it stays on the top of the curb, and doesnt dip down into the grass too bad. I use a turbo nozzle on my wand, at full strength.